[issue1545463] New-style classes fail to cleanup attributes

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

In PyImport_Cleanup(), sys and __builtin__ are the last ones deleted.
What if PyGC_Collect() is called just before?

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue1545463>
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